.header {
  display: flex;
  height: px2rem(120);
  align-items: center;
  background: #fff;
  position: fixed;
  top: 0;
  width: 100%;
  max-width: 750px;
  .left {
    width: px2rem(100);
  }
  .center {
    flex: 1;
  }
  .right {
    width: px2rem(100);
  }
}

.body {
  margin-top: px2rem(120);
}